Publication

Energy dissipation downstream of Piano Key Weirs – Case of study of Gloriettes Dam (France)

Jean-Louis Boillat, Matteo Paolo Elia Antonio Federspiel
2011
Conference Papers

Abstract

The Gloriettes concrete arch dam in the French Pyrenees showed a deficit of 80 m3/s for the new design flood of 150 m3/s. To address the problem, a Piano Key Weir (PKW) as an additional spillway was designed. The existence of a geotechnically unstable zone downstream of the PKW site, as well as requirements for environmental integration, did not allow a direct trajectory of the tailrace channel, but imposed an abrupt change in direction halfway. A stepped channel including an intermediate stilling basin was conceived for this purpose. The energy dissipation over the total length of the restitution channel for this condition was found to be about 90 per cent. Since the construction works could only be carried out in summer, the works were split into two stages: summer 2009 (excavation of the stepped reaches and the stilling basin) and summer 2010 (construction of the PKW and completion).

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https://infoscience.epfl.ch/entities/publication/4e2278e7-a8bd-4ae0-ac53-4f3e36cd65c0

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Jean-Louis Boillat, Matteo Paolo Elia Antonio Federspiel
2011
Conference Papers

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/4e2278e7-a8bd-4ae0-ac53-4f3e36cd65c0

About this result

Related concepts (19)

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An abrupt climate change occurs when the climate system is forced to transition at a rate that is determined by the climate system energy-balance, and which is more rapid than the rate of change of the external forcing, though it may include sudden forcing events such as meteorite impacts. Abrupt climate change therefore is a variation beyond the variability of a climate. Past events include the end of the Carboniferous Rainforest Collapse, Younger Dryas, Dansgaard-Oeschger events, Heinrich events and possibly also the Paleocene–Eocene Thermal Maximum.

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Related publications (1)

Energy dissipation downstream of Piano Key Weirs – Case of study of Gloriettes Dam (France)

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